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BBM Platform User

Provides read-only access to a BBM user's
information as defined in their BBM profile.
Instances of this object are not created, but are obtained from the BBM
platform.

BBM social
graph:

Applications can listen for changes in the social graph by assigning a callback to
blackberry.bbm.platform.users.onupdate.
Events are fired for both the current user and their contacts who have the
application installed. You can listen for user profile property changes, such as
display name and display picture, and also when a user installs/uninstalls your
application.